.middleSite{
    height: 50vh;
    width: 70vw;
    background-color: red;
    margin:0 auto;
}
.leftNav{
    height: 100%;
    width: 30%;
    background-color: white;
}
.banner{
    width: 70%;
    height: 100%;
    position:relative;
}
.leftTitle{
    height: 14.28%;
    background-color: #313131;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;

}
.banner img{
    width: 100%;
    height: 100%;
    position: absolute;
    display: none;
}
.banner button{
    position: absolute;
    top: 45%;
    height: 40px;
    width: 40px;
    border-radius: 50%;
    font-size: larger;
    border: none;
    background-color: rgba(255,255,255,0.6);
}